<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width:300px;
            height:100px;
            background-color:#ff9900;
            text-algin: center;
            border-radius: 25px;
            box-shadow: 10px 10px 5px #888888;
        }

    </style>
</head>
<body>
<div>CSS3新属性允许向元素添加圆角</div>
</body>
</html>
